[*]Add Critical Damage Scroll (Scroll depends on what class your item is (Low/Medium/High/Highest) on the first slot with 10 force cores. If it succeeded proceed to Step 3 . If not Try to add Critical Damage again. Succeeding will make your item 1 SLOT Critical Damage Increase and 2 Clean Slots.

[*]Now , this is the part where you will need bunch of luck , for the second slot , Put Random Scroll (The ones named "Random") there are many options that might come out on this one , but all you need is Critical Rate . Note : If the Option that came out is not Critical Rate , you will need to put a Critical Damage( Crit. Damage so that if ever it success the item won't be that much of a trash ) on the THIRD SLOT w/ ONLY ONE Force Core , so it will make the success rate at a very low point of succeeding . The most outcome of this will be a fail , Failing on the Third Slot Option adding will erase the 2nd slot you've added which is the option which is not Critical Rate. Then repeat the method until you got a Critical Rate on the second slot. If Critical Rate shows up proceed to STEP 4 , IF NOT continue on doing STEP 3.

[*]Once you had your Critical Rate on the second slot . You should Upgrade your the item to +15 so that the rate of succession of the third slot will be 99% of success. Note : If this fails , The Critical Rate Option will be removed . So better make it +15 to have the highest success rate possible .

[*]If you had done step 4 or if you want to risk even its not +15 . Add Critical Damage on the 3rd SLOT with 10 cores for a 99% success rate (if your item is +15)

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TIPS :

I suggest the item should be on +0 / +1 / +2 on STEPS 1 to 3 .

Use 2 slot items to get the best option

Follow the scrolls I've mentioned so the item won't be full of fail option, it will be still be useful even if failure comes

NOTE: Do this at your own risk . Its just a Guide , Its not 100% sure that you will get Critical Rate Option If you do want Critical Rate Option in a sure way Get a Critical Rate Scroll or Just Donate to get your desired items

P.S. I will update the thread as soon as I've completed the Images I need .